InDesign cursor appears as pixelated box

Problem

Cause

At this moment, InDesign CC 2017 or earlier are not compatible with macOS High Sierra.

Solution

For some people, deactivating the GPU Performance will work.

Go to InDesign > Preferences... in the menubar (CMD + K)

Select the tab GPU Performance

Deactivate the option GPU Performance

Click on OK

Restart InDesign

WARNING:

Although this workaround seems to work for some people, we'll have to wait for a final fix (released by either Apple or Adobe or both). So we strongly advise you to not upgrade to macOS High Sierra 10.13, unless you really don't have a choice! Always install updates on test machines and leave production machines untouched until you are sure everything is working well on your test machine!